Chongqing University

Chongqing Samhida Grinding Machine Company

Chongqing Shangjia Electronic Co., Ltd.

Chongqing Shangjai Electronic

Ping Li

Shuchun Li

Xinren Liao

Liang Fu

Juncai Ma

Zhan Xu

Weipeng Zhang

FuSheng Pan

Ying Liu

Junfeng Yang

Hualin Xie

Guijian Xiao

Yun Huang

Lai Zou

Provided are a method and molten salt system for recovering rare earth elements from NdFeB waste and use of ferric oxide as a raw material of a manganese-zinc ferrite. The molten salt system comprising the following components in percentage by weight: 40% of KAlFor NaAlF, 40% of KBeF, and 20% of KAlF. By adopting the three-component molten salt system of the present invention, recovery rates of rare earth elements extracted from NdFeB waste all can reach 98% or above. By adopting the three-component molten salt system, extraction temperature is 100-400° C. lower than that of all current similar halogenation methods, and extraction time is fold shorted to 1-3 h. The reduction of the extraction temperature and the shortening of the melting time greatly reduce the energy consumption of extracting rare earth elements from NdFeB waste, and the economic benefits are remarkable.

Method for recovering rare earth elements from NdFeB waste and use of ferric oxide as raw material of manganese-zinc ferrite

Provided is a method for preparing a soft magnetic manganese-zinc ferrite composite by removing impurities from industrial waste step by step. Manganese-containing waste residue is crushed and dried, and then mixed with a flux in a muffle furnace and roasted at a temperature below 1000° C. till solid-liquid stratification; then, multi-step impurity removal is performed to obtain a high-purity quaternary purification solution of manganese sulfate. Similarly, zinc residue is melted to remove impurities, and then multi-step impurity removal is performed to obtain a high-purity quaternary purification solution of zinc sulfate. According to a manganese-zinc-iron ratio required for the manganese-zinc ferrite, the two purification solutions are mixed, and ferrous sulfate is added. The mixed purification solution is coprecipitated with ammonium bicarbonate, washing is performed, and co-precipitated powder is decomposed into ferric oxide, manganese tetroxide and zinc oxide which are then roasted to obtain the manganese-zinc ferrite composite.

Method for preparing soft magnetic manganese-zinc ferrite composite by removing impurities from industrial waste step by step

A method for synchronous production of manganese tetraoxide and ferric oxide for a soft magnetic material by using marine polymetallic nodules includes: 1) crushing and grinding marine manganese nodules and baking to a constant weight; thoroughly mixing with a mixed flux and roasting in a muffle furnace; 2) carrying out solid-liquid separation, washing solid-phase precipitates with water, grinding the solid, adding sulfuric acid, controlling the temperature to be below 50&#xb0; C., and vacuuming a reactor up; 3) adding a reducing agent to react at room temperature for 5-10 min, adding ammonia water to adjust the pH value to 5.5, and carrying out separation and filtering; 4) controlling the temperatures of manganese sulfate and ferric sulfate solutions to be below 50&#xb0; C., and adding ammonium sulfide; and 5) washing with deionized water, and calcining at 800-900&#xb0; C. for 1-3 s by a suspension low-temperature instantaneous firing system.

Method for synchronous production of manganese tetraoxide and ferric oxide for soft magnetic material by using marine polymetallic nodules

An abrasive belt grinding device is provided, a supporting plate passes through an inner cylinder, and is fixed to the inner cylinder, the inner cylinder is rotatably connected to an outer cylinder bracket, a winding reel and an unwinding reel are arranged side by side in a left-right direction at an upper end of the supporting plate, and are driven by respective first servo motors, one end of the abrasive belt is wound in a belt groove of the winding reel, and another end of the abrasive belt is wound over the first transition wheel, the first tension pulley, the third transition wheel, the fifth transition wheel, the seventh transition wheel, the contact wheel, the eighth transition wheel, the sixth transition wheel, the fourth transition wheel, the second tension pulley, and the second transition wheel, and is finally wound in a belt groove of the unwinding reel.

Abrasive belt grinding device for profile precision consistency

An abrasive belt grinding center applicable to grinding and polishing of a whole profile of a blisk is provided, an X-axis feed mechanism, a Y-axis feed mechanism, a Z-axis feed mechanism, a B-axis rotation mechanism and a C-axis rotation mechanism constitute a grinding head feed mechanism, and a housing, a drum, a synchronous driven pulley, a synchronous belt, a synchronous driving pulley, and a grinding head rotation driving motor constitute a grinding head rotation mechanism. In the present application, two grinding heads are utilized to reasonably assign the machining angle and the feeding, and rough machining and fine machining can be both realized by one time of clamping, and the combination of six degrees of freedom in space is achieved by a short drive chain, and further the rigidities of a grinding head mechanism and a workpiece clamping mechanism are ensured.

Abrasive belt grinding center applicable to grinding and polishing of whole profile of blisk

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Chongqing, China

Ping Li